Question
Tue April 17, 2012 By: Sambhavi B
 

Find charge on 1.90 g of PO4 2-

Expert Reply
Thu April 19, 2012
The molecular mass of PO42- 95 g.
The no of electrons in  PO42- are  49.
Charge on one electron =1.6 x10-19 C
Number of molecules in 1.9 g PO42-  = 6.02 X1023  X   1.9
                                                       ------------------
                                                            95
                                                                     = 0.1204 X 1023
So number of electrons in 0.1204 X 1023 molecules are 0.1204 X 1023  x 49 =5.8996 X 1023 electrons.
 So charge = 5.8996 X 1023 X 1.6 x10-19
 
                     =9.43936 X 104
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